11657661 has 8 divisors (see below), whose sum is σ = 15586080. Its totient is φ = 7750512.

The previous prime is 11657641. The next prime is 11657663. The reversal of 11657661 is 16675611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11657661 - 2⁵ = 11657629 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11657663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3990 + ... + 6263.

It is an arithmetic number, because the mean of its divisors is an integer number (1948260).

Almost surely, 2^11657661 is an apocalyptic number.

It is an amenable number.

11657661 is a deficient number, since it is larger than the sum of its proper divisors (3928419).

11657661 is a wasteful number, since it uses less digits than its factorization.

11657661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10635.

The product of its digits is 7560, while the sum is 33.

The square root of 11657661 is about 3414.3317062055. The cubic root of 11657661 is about 226.7446979996.

The spelling of 11657661 in words is "eleven million, six hundred fifty-seven thousand, six hundred sixty-one".